tdlight/tdutils/td/utils/port/PollFlags.cpp
levlam 943fc13900 Move PollFlags to separate header.
GitOrigin-RevId: 5c97229d6c29fb281c6c1100530b14bcc1aaa827
2018-09-10 02:37:05 +03:00

72 lines
1.6 KiB
C++

//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/utils/port/PollFlags.h"
namespace td {
bool PollFlagsSet::write_flags(PollFlags flags) {
if (flags.empty()) {
return false;
}
auto old_flags = to_write_.fetch_or(flags.raw(), std::memory_order_relaxed);
return (flags.raw() & ~old_flags) != 0;
}
bool PollFlagsSet::write_flags_local(PollFlags flags) {
return flags_.add_flags(flags);
}
bool PollFlagsSet::flush() const {
if (to_write_.load(std::memory_order_relaxed) == 0) {
return false;
}
auto to_write = to_write_.exchange(0, std::memory_order_relaxed);
auto old_flags = flags_;
flags_.add_flags(PollFlags::from_raw(to_write));
if (flags_.can_close()) {
flags_.remove_flags(PollFlags::Write());
}
return flags_ != old_flags;
}
PollFlags PollFlagsSet::read_flags() const {
flush();
return flags_;
}
PollFlags PollFlagsSet::read_flags_local() const {
return flags_;
}
void PollFlagsSet::clear_flags(PollFlags flags) {
flags_.remove_flags(flags);
}
void PollFlagsSet::clear() {
to_write_ = 0;
flags_ = {};
}
StringBuilder &operator<<(StringBuilder &sb, PollFlags flags) {
sb << "[";
if (flags.can_read()) {
sb << "R";
}
if (flags.can_write()) {
sb << "W";
}
if (flags.can_close()) {
sb << "C";
}
if (flags.has_pending_error()) {
sb << "E";
}
return sb << "]";
}
} // namespace td